Vaporizing burner for petroleum, methylated spirits, or the like



Jan. 25, 1944. J, UNDM ARK 2,340,000

VAPORIZING BURNER FOR'PETROLEUM, METHYLATED SPIRITS, OR THE LIKE Filed Sept. 16, 1941 v .iz or'n ej- Patented Jan. 25, 1944 VAPORIZING BURNER FOR PETROLEUM, v

METHYLATED SPIRITS, OR THE LIKE Johan Gunnar Lindmark, Stockholm, Sweden Application September 16. 1941, Serial No. 411,060 In Sweden October 21, 1940 6 Claims. (Cl. 15863) The present invention relates to such vaporizing' burners for liquid hydrocarbons, methyl alcohol and similar liquid; fuels as are provided on the one hand with a burner head seated over the upper mouth of a vertical mixing pipe for vaporized fuel and air and adapted to serve as an aftermixing chamber, and on the other with a vaporizing ring which embraces the burner head and is adapted to be flushed over by the flame on its preferably funnelshaped inner surface. It is an object of the invention to insure a mor effective utilization of the fuel for preheating the burner while maintaining during normal operation favourabl conditions for an effective cooling of the burner head and a satisfactory heating of the vaporizing ring. With said and other objects in view there has been provided, according to the present invention, a vaporizing burner of the kind set forth in which the burner head is shaped as a hollow ball having a number of flame apertures arranged within a comparatively narrow zone immediately above the horizontal middle plane of the ball, and the vertical mixing pipe which projects into the ball carries at its lower end a cup adapted to hold the methylated spirits or other fuel used for preheating the burner, said cup preferably having an outer diameter which is less than the outer' diameter of the burner head.

The invention will now be described more in detail having reference to the accompanying drawing, in which there is shown schematically a preferred embodiment.

In the drawing Figure 1 shows a side view of the burner, part- 13! in vertical section,

Figure 2 shows an elevation taken from the left side of Figure 1, with certain parts broken away, while Figure 3 shows the detachable burner head by itself.

Referring to the drawing, l designates the supply pipe for the liquid fuel, said pipe extending from a fuel receptacle, not shown, to the va porizing ring 2 provided with a funnel-shaped inner surface, the gasifled fuel passing from said ring through a bail-shaped pipe 4 to the gas nozzle 5. The burner head 6 is shaped substantially as a hollow ball with a great number of flame apertures provided within a comparatively narrow zone immediately above the horizontal middle plane of the ball. At its middle portion the burner head is provided with a flange or head 8 which extends along the circumference thereof, the burner head resting by means of said bead 8 detachably in such a manner on a flange 3, projecting inwardly and somewhat downwardly from the bottom of the vaporizing ring, so as to cause the top of the burner head to be positioned at a point substantially on a level with the upper edge of the vaporizing ring 2. In the lower wall surface of thehead there is provided an opening in which there is ecured an annular sleeve 9 provided with an internal thread ing. A vertical mixing pipe ill for fuel-gas and air is screwed so far into the sleeve 9 as to cause a shoulder II on the pipe to bear against the underside of the sleeve, the lower'mouth of the pipe being then'positioned immediately above the' gas nozzle 5 while its upper mouth reaches up to a level somewhat above the zone within which the flame apertures! in the burner head are positioned, as is clear from Figure 1. In Figure 3 the pipe I0 is shown in a position partly pulled out of the burner head 6 and the sleeve 9, respectively. At its lower end the pipe Ill is shaped so as to form an annular cup I2, which is'int'ended' to hold the methylated spirits or other fuel for preheating the burner. The cup has a diameter which is less than the outer diameter of the burner head, and it is made with an even-' ly bent, curved lower surface, all for the purpose of insuring that during normal operation the ris-' ing air current shall effectively flush over and cool both the cup and the mixing pipe made integral therewith and the lower unperforated half of the ball-shaped burner head.

When using a petroleum-stove, spirit-stove or the like equipped with the described burner, a

quantity of preheating spirits is'first poured into the space between the vaporizing ring 2 and the burner head 6, from where the spirit flows, along the external walls of the burner head 6 and the mixing pipe lo down into the cup l2. The flow-' ing down of thespirits is facilitated since the' flange 3 is made somewhat inclined, as shown on the drawing. The flame from the burning preheating spirits is guided along the evenly bent underside of the burner head onto the vaporizing ring 2, so that said ring is effectively and. rapidly heated. After the spirit flame has preheated the burner sufllciently, the fuel liquid is supplied to the burner, for instance in known manner through pumping, which operation, in view of the positioning of the preheating cup above the gas nozzle 5, may be carried out while the preheating spirit is still burning, causing the mixture of fuel-gas and air emerging from the flame apertures I to become automatically ignited, whereupon the stove may be immediately placed in use.

With the burner according to the invention there is produced a noiselessly and quickly burning flame, which does not deposit any soot on the cooking utensil to be heated, the flame being well protected against draft and other disturbing influences on account of the. particular positioning of the burner head. With regard to appearance and effect the flame is similar to an ordinary gas flame. It may be adjusted to a very small size without becoming smoky or showing any tendency to go out. The arrangement of the flame apertures in a spherical surface in combination with the funnel shape of the inner surface of the embracing vaporizing ring causes the composite flame to become more concentrated, 1. e., directed more centrally towards the bottom of a cooking utensil placed above the bumer, than in previously known vaporizing burners, particularly for-petroleum. In spite, of the presence of the preheatingcup. l2 immediate- 1y underneath the burner head 6, the cooling of the burner head during long operation has proved to be so effective that no overheating or heating to a red heat respectively of the burner head takes place, even if the burner is permitted to burn for a long time with as big a flame as possible. This favourable characteristic appears to be due in the first instance to the ball shape of the burner head, which results in that a considerable portion of the walls of the burner head form a streamline-shaped cooling surface extending below the vaporizing ring, which cooling surface in spite of the presence of the preheating cup is flushed over partl at least by the rising air current, but it is apparently also due to the fact that the comparatively cold fuel-air mixture which rises up through the mixing pip I!) will effectivelysweep over the inner surface of the imperforate top of the burner head, thereby keeping the temperature of that wall of the burner head, which is most subjected to heating, within permissible limits. For this reason'there is no need to use a particularly temperature resistive metal for the manufacture of the burner.

The invention is not limited to the embodiment described above and shown on the drawing, since, of course, the various details of the burner may be arranged and constructed in other manner than now indicated within the purview of the invention.

What is claimed is:

1. A vaporizing burner for liquid hydrocarbons, methyl alcohol and similar fuels which comprises in combination a burner head in the shape of a hollow ball provided with flame apertures arranged in a horizontalzone just above the horizontal middle plane of the ball, a vertical mixing pipe projecting into the interior of said ball and adapted to supply a mixture of fuel and air to said burner head, an annular cup for holding preheating fuel mounted on the lower end of said mixing pipebelow said ball, a hollow vaporizing ring adapted to be heated by the flame mounted around said burner head and having a funnel shaped inner surface adapted to direct preheating fuel into said annular cup, means for supplying a vaporizable fuel to said vaporizing ring, a gas nozzle situated just below the lower nd of said mixing pipe and means for leading fuel vaporized in said vaporizing ring to said gas nozzle.

2. The vaporizing burner of claim 1 wherein the upper end of said mixing pipe is positioned in such fashion that it discharges a mixture of gaseous fuel and air against the inner surface of the imperforate top of said burner head thereby serving to cool said head.

3. The vaporizing burner of claim 1 wherein said vaporizing ring is mounted around the top only of said burner head and wherein the top of said ring is substantially on a level with the top of said burner head.

4. The vaporizing burner of claim 1 wherein said burner head is provided with a horizontal circumferential bead and the vaporizing ring is provided with a cooperating flange adapted to support the burner head and the mixing tube by engaging said bead.

5. The vaporizing burner of claim 1 wherein said vaporizing ring is provided with an inner flange adapted to support said burner head, said flange being also adapted to direct preheating fuel, poured into said ring, against said head and downwardly into said annular cup.

6. A vaporizing burner for liquid hydrocarbons which comprises in combination a burner head in the shape of a hollow ball provided with flame apertures arranged in a norrow horizontal zone immediately above the horizontal median plane of said ball, a hollow vaporizing 'ring embracing said burner head in the neighborhood of said median plane in such manner as to be in the path of the flames from said head while leaving the unperforated lower half of said head uncovered, means for supplying a vaporizable fuel to said vaporizing ring, a vertical mixing pipe connected with said burner head and adapted to supply fuel thereto, a gas nozzle spaced below and adapted to supply vaporized fuel to said mixing pipe, a connecting pipe leading from said vaporizing ring to said nozzle and adapted to convey vaporized fuel from said vaporizing ring to said nozzle, and a cup mounted on the lower end of said vaporizing pipe adapted to hold preheating fuel; said cup, vaporizing ring and burner head beingso constructed and arranged that flames from said preheating cup are guided against said vaporizing ring after passing along the lower half of said burner head.

JOHAN GUNNAR LINDMARK. 

